Group Water_and_ions referenced in the .mdp file was not found

GROMACS version:
GROMACS modification: Yes/No

Hello, I have got an error about water_ions not found

Firstly I have an error about NA molecules

ERROR 1 [file topol.top, line 109640]:
No such moleculetype NA
I have posted a question about it (ERROR No such moleculetype NA)

Then I have change their name from NA in topol and solv_ion files to SOD, because when I check the ion.itp file I found this lines:

[ moleculetype ]
;Sodium Ion
; molname nrexcl
SOD 3
so, I assume that I have to change the name of NA to SOD.
The code run correctly and other next lines

but when I was in code line: I have used the line gmx grompp -f nvt.mdp -c em.gro -r em.gro -p topol.top -n index.ndx -o nvt.tpr
I got an error:
this is the whole message

          :-) GROMACS - gmx grompp, 2020.1-Ubuntu-2020.1-1 (-:

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GROMACS: gmx grompp, version 2020.1-Ubuntu-2020.1-1
Executable: /usr/bin/gmx
Data prefix: /usr
Working dir: /mnt/d/Articles/Y MDs/Works/2022/Linani
Command line:
gmx grompp -f nvt.mdp -c em.gro -r em.gro -p topol.top -n index.ndx -o nvt.tpr

Ignoring obsolete mdp entry ‘title’
Ignoring obsolete mdp entry ‘ns_type’
Setting the LD random seed to 1848058077
Generated 167799 of the 167910 non-bonded parameter combinations
Generating 1-4 interactions: fudge = 1
Generated 117519 of the 167910 1-4 parameter combinations
Excluding 3 bonded neighbours molecule type ‘Protein_chain_C’
turning H bonds into constraints…
Excluding 3 bonded neighbours molecule type ‘cp11’
turning H bonds into constraints…
Excluding 2 bonded neighbours molecule type ‘SOL’
turning H bonds into constraints…
Excluding 3 bonded neighbours molecule type ‘SOD’
turning H bonds into constraints…
Setting gen_seed to -458316911
Velocities were taken from a Maxwell distribution at 300 K


Program: gmx grompp, version 2020.1-Ubuntu-2020.1-1
Source file: src/gromacs/gmxpreprocess/readir.cpp (line 2701)

Fatal error:
Group Water_and_ions referenced in the .mdp file was not found in the index
file.
Group names must match either [moleculetype] names or custom index group
names, in which case you must supply an index file to the ‘-n’ option
of grompp.

For more information and tips for troubleshooting, please check the GROMACS
website at Common Errors — GROMACS webpage https://www.gromacs.org documentation

How to fix this error?

Did you recreate the index file after the “SOD to NA” change?

Dear Teslim
I did not create the index file
how to create it?